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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6df63e82374678885ffb7d347a09b30e82d656b936d9c043a066b87d4594bd0' 
  AND token = 'PNIOByiJwsELQNVV0EHY3oWM6QdAY7Z+T5fhgoYIib4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}